---
id: 612e813b3ba67633222cbe54
title: Step 6
challengeType: 0
dashedName: step-6
---
# --description--
Remember that a `class` attribute can have multiple values. To separate your white keys from your black keys, you'll add a second `class` value of `black--key`. Add this to your second, third, fifth, sixth, and seventh `.key` elements.
# --hints--
Your second `.key` element should also have a `class` of `black--key`.
```js
const key = document.querySelectorAll('.key')?.[1];
assert(key?.className?.includes('black--key'));
```
Your third `.key` should have `black--key` in the `class`.
```js
const third = document.querySelectorAll('.key')?.[2];
assert(third?.classList?.contains('black--key'));
```
Your fifth `.key` should have `black--key` in the `class`.
```js
const fifth = document.querySelectorAll('.key')?.[4];
assert(fifth?.classList?.contains('black--key'));
```
Your sixth `.key` should have `black--key` in the `class`.
```js
const sixth = document.querySelectorAll('.key')?.[5];
assert(sixth?.classList?.contains('black--key'));
```
Your seventh `.key` should have `black--key` in the `class`.
```js
const seventh = document.querySelectorAll('.key')?.[6];
assert(seventh?.classList?.contains('black--key'));
```
You should have five `.black--key` elements.
```js
const blackKeys = document.querySelectorAll('.black--key');
assert(blackKeys?.length === 5);
```
You should have seven `.key` elements.
```js
const keys = document.querySelectorAll('.key');
assert(keys?.length === 7);
```
# --seed--
## --seed-contents--
```html
Piano
--fcc-editable-region--
--fcc-editable-region--
```
```css
```